There are several examples of strictly carnivorous nutrition in man in which the success attained is about as great as that seen in animals on similar diets. Thus the Eskimo, while a small people, are vigorous and capable of considerable exertion. There are climatic factors which may perhaps be regarded as a handicap to their well-being, but it is not easy to evaluate these, for the animals of the Arctic regions and the Eskimos as well appear to be thoroughly acclimated and to suffer little from low temperatures or lack of sunlight over long periods.

The American Indians who inhabited the plains east of the Rocky Mountains and subsisted upon the bison, were likewise a strictly carnivorous people during the greater part of the year. The cultivated products and wild fruits and berries formed at best but a slight variation from the monotonous flesh food supply. Lewis and Clark, Parkman and other reliable observers, testify to their being, in many instances, fine examples of physical development. Like the Eskimos they ate the entire edible part of the animals which served them as food. They did not even discard blood or the alimentary tract.